Evolution of a presidential selfie

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RESTRICTED TO EDITORIAL USE / NO ARCHIVES / TO BE USED WITHIN 30 DAYS FROM 10/12/2013 A screengrab taken from the South African Broadcasting Corporation live feed shows Danish Prime Minister Helle Thorning-Schmidt (L), US President Barack Obama (C) and First Lady Michelle Obama attending the memorial service for late South African President Nelson Mandela at Soccer City Stadium in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. Mandela, who was elected South Africa's first black president after spending nearly three decades in prison, had been receiving treatment for a lung infection at his Johannesburg home since September, after three months in hospital in a critical state. AFP PHOTO / SABC-/AFP/Getty Images ORG XMIT: 455215463

RESTRICTED TO EDITORIAL USE / NO ARCHIVES / TO BE USED WITHIN 30 DAYS FROM 10/12/2013 A screengrab taken from the South African Broadcasting Corporation live feed shows Danish Prime Minister Helle Thorning-Schmidt (L), US President Barack Obama (C) and First Lady Michelle Obama attending the memorial service for late South African President Nelson Mandela at Soccer City Stadium in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. Mandela, who was elected South Africa's first black president after spending nearly three decades in prison, had been receiving treatment for a lung infection at his Johannesburg home since September, after three months in hospital in a critical state. AFP PHOTO / SABC-/AFP/Getty Images ORG XMIT: 455215463 (- / AFP/Getty Images)

RESTRICTED TO EDITORIAL USE / NO ARCHIVES / TO BE USED WITHIN 30 DAYS FROM 10/12/2013 A screengrab taken from the South African Broadcasting Corporation live feed shows Danish Prime Minister Helle Thorning-Schmidt (L), US President Barack Obama (C) and First Lady Michelle Obama attending the memorial service for late South African President Nelson Mandela at Soccer City Stadium in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. Mandela, who was elected South Africa's first black president after spending nearly three decades in prison, had been receiving treatment for a lung infection at his Johannesburg home since September, after three months in hospital in a critical state. AFP PHOTO / SABC-/AFP/Getty Images ORG XMIT: 455215463